A Comparison Study of <i>f</i>oF2 Derived from Oblique Sounding Network and Vertical Ionosonde in Northern China

Liu, Jing; Lou, Wenyu; Zhang, Xuemin; Shen, Xiaolin

doi:10.3319/tao.2016.03.06.01(aa)

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…Using these data, some perturbations were found before the Nepal M s 8.1 earthquake on 25th April 2015. Another is the China Seismo‐ionospheric Ground‐based Monitoring Network (CSGMN) in Northern China (Liu J et al, 2016b). It was found that oblique sounding data present similar change characteristics to those seen in vertical sounding data.…”

Section: Ionospheric Dynamicsmentioning

confidence: 99%

Chinese ionospheric investigations in 2016–2017

Liu

Wan

2018

Earth and Planetary Physics

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After the release of the previous report to the Committee on Space Research (COSPAR) on progress achieved by Chinese scientists in ionospheric researches (Liu LB and Wan WX, 2016), in the recent two years (2016–2017) many interesting new investigations into various ionospheric related issues have been completed. In this report, about 100 publications are summarized. The topics highlighted are as follows: Ionospheric space weather, ionospheric dynamics, ionospheric climatology and modelling, ionospheric irregularity and scintillation, Global Navigation Satellite System (GNSS) related ionospheric issues and other techniques, and radio wave propagation in the ionosphere. An outstanding feature is that more and more observations from the Meridional Project supported the ionospheric investigations.

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Section: Ionospheric Dynamicsmentioning

confidence: 99%

Chinese ionospheric investigations in 2016–2017

Liu

Wan

2018

Earth and Planetary Physics

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“…Using vertical/slant ionosounding, Pulinets and Boyarchuk (2004) [9] presented the first comprehensive study of F2 layer critical frequency (foF2) anomalies observed before strong earthquakes. [10] carried out a comparative study of foF2 anomalies in northern China using an oblique sounding network and a vertical ionosonde. It was shown that these anomalies exhibited similar characteristics and could be used to investigate seismoionospheric effects.…”

Section: Introductionmentioning

confidence: 99%

Seismo-Ionospheric Effects Prior to Two Earthquakes in Taiwan Detected by the China Seismo-Electromagnetic Satellite

et al. 2022

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In this paper, we focused on the characteristics of the seismo-ionospheric effects related to two successive earthquakes, namely, the earthquakes in 2022 in Taitung Sea, Taiwan, China, with magnitudes (M) of 6.7 and 6.3, at 23.45° N, 121.55° E and 23.39° N, 121.52° E and with the same focal depth of 20 km, which were detected by the China Seismo-Electromagnetic Satellite (CSES). By applying the sliding interquartile range method to electron density (Ne) data acquired by the Langmuir probe (LAP) onboard the CSES and the grid total electron content (TEC) data obtained from the Center for Orbit Determination in Europe (CODE), positive anomalies were found under quiet geomagnetic conditions on 2‒3 March and 8‒9 March 2022—that is, 19–20 and 13–14 d before the earthquakes, respectively, and the global ionospheric mapping (GIM) TEC data suggested that anomalies may also have been triggered in the magnetic conjugate area 13–14 d prior to the earthquakes occurrences. In addition, the CSES Ne data showed enhancements 3 and 5 d before the earthquakes occurred. Furthermore, 138 earthquakes with M ≥ 5.0 that occurred in Taiwan and the surrounding region during the period February 2019 to March 2022 were statistically analyzed using the CSES Ne data. The results show that most of the Ne anomalies were positive. Moreover, the greater the earthquake magnitude, the greater the frequency of the anomalies; however, the amplitude of the anomalies did not increase with the earthquake magnitude. The anomalies were concentrated during the period of 10 d before to 5 d after the earthquakes. No increase in the amplitude of anomalies was observed as the time of the earthquakes approached. Finally, based on evidence relating to earthquake precursor anomalies, we conclude that it is possible that earthquakes in Taiwan and the surrounding region affect the ionosphere through the geochemical, acoustic, and electromagnetic channels, as described by the lithosphere‒atmosphere‒ionosphere coupling (LAIC) model, and that the two studied earthquakes in Taiwan may have induced ionospheric effects through the geochemical channel.

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